This rule is clear enough. Not sure are you serious about this? Google translate works correctly for this
I understand rule but why rule exist?
This is DotA forum.
Are you selling a car? Go to proper website.
Are you offering dick sucking services? Go to proper website.
Are you offering translating services? Go to proper website.
Are you interested in spilling blood in the name of Khorne? Contact me via PM.
Do you need to get your eshop known? Go to proper website.
Some services one might be offering might be unproper for some people (example - you don't advertise your gay porn site on 9gag). The staff don't wanna bother with checking your website/services.
Also, nobody will let you use their site for your own profit without any fees.